I'm sure the value will come back. Valuing X at $19B puts the value of the whole alphabet at $500B, which seems low for an established technology which has been in continuous use since before the time of the Roman Empire.
The US GDP is $24 trillion, and all the financial reports supporting that valuation use the Roman Alphabet. The Alphabet is essential to justifying the value of the entire US Economy. I think it's reasonable to value the worth of the alphabet at 8% of GDP, which would give X a fair value of $74B.
See, haters? Elon really is a financial genius. Numbers don't lie.
Come on. Obviously not all letters in the alphabet are worth the same. X is not that popular even if you take into account its different uses like ':x', 'xoxo' or 'xxx'. Not that many words use x and if one day it collapses and becomes unavailable you can just substitute it with 'ks' like 'seks' or 'meksican'.